Numbers beginning with 203-577

Waterbury, a city in the U.S. state of Connecticut on the Naugatuck River, 33 miles (45 minutes) southwest of Hartford and 77 miles (90 minutes) northeast of New York City. As of the 2010 census, Waterbury had a total population of 110,366, making it the 10th largest city in the New York Metropolitan Area, 9th largest city in New England and the 5th largest city in Connecticut. source

Area code 203 is a North American telephone area code that covers the southwestern part of Connecticut, and is overlaid with area code 475. The area codes stretch from Connecticut's western border, along its southern coast, to Madison, and north to Meriden. (The rest of Connecticut is served by the 860 area code, which is expected to be overlain with 959 on August 30, 2014.) The region encompassed by 203 and 475 roughly corresponds to the Connecticut side of the New York metropolitan area. Prior to August 28, 1995 (when the split with 860 took effect), area code 203 encompassed all of Connecticut. source